throught my time here, iv'e adding cheats, and figured it out. The only reason i saw this actually was becaus it came up that someone replied. You have to make sure you add it to the correct game in the correct section of the file. There are multiples of the same game in the folder, just diff types for example (E) and (U) have different cheat lists. Also, when copying the cheat, you need to make surte that youi didn't copy the number too.
For example,
Cheat 42 Blah Blah Blah
Cheat 43 Blah Blah Blah
Cheat 44 Blah Blah Blah
Cheat 44 Blah Blah Blah
You need to make sure that when you entedered it, you just didnt replace the good meaty stuff, but the number as well